[PATCH v3 4/6] drm: atmel-hlcdc: enable sys_clk during initalization.

[<Claudiu.Beznea@xxxxxxxxxxxxx>]

From: Sandeep Sheriker Mallikarjun <sandeepsheriker.mallikarjun@xxxxxxxxxxxxx>

For SAM9X60 SoC, sys_clk is through lcd_gclk clock source and this
needs to be enabled before enabling lcd_clk.

Signed-off-by: Sandeep Sheriker Mallikarjun <sandeepsheriker.mallikarjun@xxxxxxxxxxxxx>
[claudiu.beznea@xxxxxxxxxxxxx: add fixed_clksrc checks]
Signed-off-by: Claudiu Beznea <claudiu.beznea@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
index 0be13eceedba..8bf51f853721 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
@@ -625,10 +625,18 @@ static int atmel_hlcdc_dc_load(struct drm_device *dev)
 	dc->hlcdc = dev_get_drvdata(dev->dev->parent);
 	dev->dev_private = dc;
 
+	if (dc->desc->fixed_clksrc) {
+		ret = clk_prepare_enable(dc->hlcdc->sys_clk);
+		if (ret) {
+			dev_err(dev->dev, "failed to enable sys_clk\n");
+			goto err_destroy_wq;
+		}
+	}
+
 	ret = clk_prepare_enable(dc->hlcdc->periph_clk);
 	if (ret) {
 		dev_err(dev->dev, "failed to enable periph_clk\n");
-		goto err_destroy_wq;
+		goto err_sys_clk_disable;
 	}
 
 	pm_runtime_enable(dev->dev);
@@ -664,6 +672,9 @@ static int atmel_hlcdc_dc_load(struct drm_device *dev)
 err_periph_clk_disable:
 	pm_runtime_disable(dev->dev);
 	clk_disable_unprepare(dc->hlcdc->periph_clk);
+err_sys_clk_disable:
+	if (dc->desc->fixed_clksrc)
+		clk_disable_unprepare(dc->hlcdc->sys_clk);
 
 err_destroy_wq:
 	destroy_workqueue(dc->wq);
@@ -688,6 +699,8 @@ static void atmel_hlcdc_dc_unload(struct drm_device *dev)
 
 	pm_runtime_disable(dev->dev);
 	clk_disable_unprepare(dc->hlcdc->periph_clk);
+	if (dc->desc->fixed_clksrc)
+		clk_disable_unprepare(dc->hlcdc->sys_clk);
 	destroy_workqueue(dc->wq);
 }
 
@@ -805,6 +818,8 @@ static int atmel_hlcdc_dc_drm_suspend(struct device *dev)
 	regmap_read(regmap, ATMEL_HLCDC_IMR, &dc->suspend.imr);
 	regmap_write(regmap, ATMEL_HLCDC_IDR, dc->suspend.imr);
 	clk_disable_unprepare(dc->hlcdc->periph_clk);
+	if (dc->desc->fixed_clksrc)
+		clk_disable_unprepare(dc->hlcdc->sys_clk);
 
 	return 0;
 }
@@ -814,6 +829,8 @@ static int atmel_hlcdc_dc_drm_resume(struct device *dev)
 	struct drm_device *drm_dev = dev_get_drvdata(dev);
 	struct atmel_hlcdc_dc *dc = drm_dev->dev_private;
 
+	if (dc->desc->fixed_clksrc)
+		clk_prepare_enable(dc->hlcdc->sys_clk);
 	clk_prepare_enable(dc->hlcdc->periph_clk);
 	regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IER, dc->suspend.imr);
 
-- 
2.7.4

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